The electronic admission database or any other applicable database of the hospital will be reviewed to identify hospitalized children/children with outpatient visits/emergency room visits, less than five years of age who had been diagnosed with acute gastroenteritis (AGE) or RV GE either by the International Classification of Diseases and Related Health Problems 10th Revision (ICD 10) diagnostic code (AA00-AA09 for intestinal infectious diseases and A08.0 for RV specific GE) or by RV positive rapid diagnosis kit results.